麦麸降低日粮消化能、代谢能和净能含量，但是不同方法（差值法和线性回归法）得到...

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　　第五十六期：麦麸降低日粮消化能、代谢能和净能含量，但是不同方法（差值法和线性回归法）得到的麦麸能值无显著差异

　　2016. J. Anim.Sci. 94(7):3012-3021

　　麦麸降低日粮消化能、代谢能和净能含量，但是不同方法（差值法和线性回归法）得到的麦麸能值无显著差异
　　N. W.Jaworski, D. W. Liu, D. F. Li和H. H. Stein

　　本试验检测了生长猪玉米豆粕型日粮中添加15%或30%麦麸对消化能、代谢能和净能的影响，并比较了不同方法（差值法和线性回归法）得到的麦麸能值之间的差异。

　　试验选用18头去势公猪（初始重54.4±4.3kg），分别置于代谢笼中。试验共3种日粮，每种日粮6个重复。基础日粮中含玉米、豆粕，无麦麸添加。其他两种日粮中分别添加15%或30%麦麸（基础日粮添加量分别为85%、70%）。试验期15天，前7天为适应期，猪只每天饲喂573kcal代谢能/kg代谢体重（BW0.6）试验日粮。第8天，将代谢笼置于开放式循环呼吸代谢室，检测氧的消耗量、二氧化碳和甲烷的生成量。饲喂量同适应期一致，并收集猪只粪便和尿液。试验第13-14天，猪只每天饲喂225 kcal代谢能/kg代谢体重（BW0.6）试验日粮，然后停止饲喂24小时，获得饥饿产热量。

　　试验结果表明随着麦麸添加量的提高，日粮干物质、总能、粗纤维、ADF和NDF的全肠道表观消化率线性降低（P≤0.05）。麦麸添加量的提高线性降低了氧的消耗量、二氧化碳和甲烷的生成量（P≤0.05），导致产热量线性降低（P≤0.05）。随着麦麸添加量的提高（0、15%、30%）日粮消化能（分别为3454、3257、3161 kcal/kg）、代谢能（分别为3400、3209、3091 kcal/kg）、净能（分别为1808、1575、1458 kcal/kg）线性降低（P≤0.05）。使用差值法计算得到的麦麸消化能、代谢能和净能分别为2168、2117、896 kcal/kg），此能值均位于用线性回归方法计算的麦麸能值（分别为2285、2217、961 kcal/kg）的95%的置信区间。

　　总之，玉米豆粕型日粮中麦麸含量的增加可以显著降低能量和养分的消化率、产热量、日粮能量（消化能、代谢能、净能），但是不同方法（差值法和回归法）得到的麦麸能值无显著差异。

　　Wheat bran reduces concentrations of digestible, metabolizable, and net energy in diets fed to pigs, but energy values in wheat bran determined by the difference procedure are not different from values estimated from a linear regression procedure

　　N. W. Jaworski, D. W. Liu, D. F. Li and H. H. Stein

　　An experiment was conducted to determine effects on DE, ME, and NE for growing pigs of adding 15 or 30% wheat bran to a corn–soybean meal diet and to compare values for DE, ME, and NE calculated using the difference procedure with values obtained using linear regression. Eighteen barrows (54.4 ± 4.3 kg initial BW) were individually housed in metabolism crates. The experiment had 3 diets and 6 replicate pigs per diet.The control diet contained corn, soybean meal, and no wheat bran. Two additional diets were formulated by mixing 15 or 30% wheat bran with 85 or 70%of the control diet, respectively. The experimental period lasted 15 d. During the initial 7 d, pigs were adapted to their experimental diets and housed in metabolism crates and fed 573 kcal ME/kg BW0.6 per day. On d 8, metabolism crates with the pigs were moved into open-circuit respiration chambers for measurement of O2 consumption and CO2 and CH4 production. The feeding level was the same as in the adaptation period, and feces and urine were collected during this period. On d 13 and 14, pigs were fed 225 kcal ME/kg BW0.6 per day, and pigs were then fasted for 24 h to obtain fasting heat production. Results of the experiment indicated that the apparent total tract digestibility of DM, GE, crude fiber, ADF, and NDF linearly decreased (P ≤ 0.05) as wheat bran inclusion increased in the diets. The daily O2 consumption and CO2 and CH4 production by pigs fed increasing concentrations of wheat bran linearly decreased (P ≤ 0.05), resulting in a linear decrease (P ≤ 0.05) in heat production. The DE (3,454, 3,257, and 3,161 kcal/kg for diets containing 0, 15, and 30% wheat bran, respectively for diets containing 0, 15, and 30% wheat bran, respectively), ME(3,400, 3,209, and 3,091 kcal/kg for diets containing 0, 15, and 30% wheat bran, respectively), and NE (1,808, 1,575, and 1,458 kcal/kg for diets containing 0, 15, and 30% wheat bran, respectively) of diets decreased (linear,P ≤0.05) as wheat bran inclusion increased. The DE, ME, and NE of wheat bran determined using the difference procedure were 2,168, 2,117, and 896 kcal/kg, respectively, and these values were within the 95% confidence interval of the DE (2,285 kcal/kg), ME (2,217 kcal/kg), and NE (961 kcal/kg) estimated by linear regression. In conclusion, increasing the inclusion of wheat bran in a corn–soybean meal based diet reduced energy and nutrient digestibility and heat production as well as DE, ME, and NE of diets, but values for DE, ME, and NE for wheat bran determined using the difference procedure were not different from values determined using linear regression。
翻译：朱滔

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玉米豆粕型日粮中麦麸含量的增加可以显著降低能量和养分的消化率、产热量、日粮能量（消化能、代谢能、净能），但是不同方法（差值法和回归法）得到的麦麸能值无显著差异。